What is resistor?

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Resist is the word which means to "oppose". Resistor is a passive electrical component which has the property of oppose the electric current & the property of opposing the flow of electron, is called resistance.
Resistor are used for many purposes, a few examples include delimit electric current, voltage division, heat generation,matching & loading circuits, control gain, & fix time constant.
Symbol & Units- The symbol for a resistor is as shown below.

The units of resistance is ohms, which is indicated by omega.
The formula for resistance is 

Connecting Resistors- A resistor when connected in a circuit, that connected can be either series or parallel.
Resistors in series- When n fixed resistors connected in series.The current I flowing through each resistor is the same in the series circuit, because there is only one path for the current to flow.
 The total equivalent resistance of the series circuit is equal to the sum of the individual resistances.

Resistors in parallel- When n fixed resistors connected in parallel. The voltage V across each resistor is the same in parallel circuit.
 The total equivalent resistance of the parallel circuit is equal to their product divided by their sum.
The equivalent resistance value for 2 resistors in parallel is calculated with these steps

Colour Coding- Colour coding is used to determine the value of resistance of the resistor. A resistor is coated with four or five colour bands, where each colour determines a perticular value.
If resistor have four colour bands then the first two coloured band indicate the first & second digit of the value and the third colour band represents the multiplier (number of zero added). The fourth colour band indicates the tolerance value.
Ex-
If resistor have five colour then three bands represent digits ,fourth one indicates multiplier & the fifth represent tolerance.

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